CN102291355B - Anti-noise digital wireless broadcast signal transmission method - Google Patents

Abstract

The invention discloses an anti-noise digital wireless broadcasting signal transmission method, which is a transmission scheme of mixing time domain and frequency domain. The anti-noise digital wireless broadcast signal transmission method of the present invention aims at the technical problems that need to be solved due to the signal peak-to-average power ratio and channel noise faced by the broadband multi-carrier digital wireless broadcast transmission system, and designs a low-complexity peak-to-average power ratio reduction method Technology, bit interleaved coding and modulation technology, signal frame time-frequency domain joint iterative separation processing technology, make the broadband multi-carrier digital wireless broadcasting system have the advantages of low peak-to-average power ratio, short synchronization time, anti-noise, controllable multi-service and so on.

Description

A kind of anti-noise digital wireless broadcasting signal transmission method

technical field

The invention belongs to the field of wireless communication, and more specifically relates to an anti-noise digital wireless broadcast signal transmission method.

Background technique

At present, television broadcasting has gradually developed from analog to digital. Digital TV broadcasting transmission system, as an important part of digital TV broadcasting, the development of its related technologies is closely related to people's quality of life, and therefore has received extensive attention from people. The technology related to digital TV broadcasting and related industries are industries with rapid development and good market prospects in the field of communication and computer. In terms of technologies related to digital TV broadcasting, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile solutions for digital TV broadcasting in a complex wave propagation environment. Transmission technology is the key technology of digital TV broadcasting system, plays a decisive role in the performance of the whole system, and is the object of everyone's key research.

Due to the rapid development of digital signal processing technology and integrated circuit technology, the system realization of Orthogonal Frequency Division Multiplexing (OFDM) technology becomes easier and easier. Because OFDM multi-carrier transmission technology has many advantages such as simple structure, high spectrum utilization rate, and anti-frequency selectivity and channel time variation, it has attracted much attention and has been deeply researched and applied in Xdsl, broadband mobile communication, broadband wireless local area network, It is widely used in many fields such as digital TV broadcasting.

The high peak-to-average power ratio (PAPR) of OFDM signals has high requirements on the linear range of amplifiers and digital-to-analog converters. If the linear range of the system cannot meet the signal changes, it will cause signal distortion and signal spectrum changes. , resulting in the destruction of the orthogonality between sub-channels, resulting in mutual interference and deteriorating system performance. Therefore, it is necessary to consider how to reduce the occurrence probability of high peak power signals in OFDM signals and reduce the impact of nonlinear distortion.

Channel coding is an important part of digital communication systems. Under multipath fading channel, the optimal design of coding, interleaving and modulation scheme can achieve the largest possible signal diversity order, so as to obtain independent fading in the symbol sequence equal to or exceeding the minimum free distance. BICM technology (BitInterleaved Coded Modulation, BICM) uses a bit interleaver and makes the encoding and modulation processes relatively independent, so that the diversity order can be expanded from different multi-ary symbols to different binary bits. That is to say, its diversity order L is the minimum Hamming distance between binary codeword sequences. Because the BICM technology makes the order of diversity significantly improved, it makes the communication system have good bit error characteristics under the multipath fading channel.

In the actual communication environment, the performance of the digital TV wireless multimedia broadcasting communication system is affected by factors such as synchronization time, clock jitter, channel fading, and channel interference. The wireless multimedia broadcasting signal transmitter transmission method is the key technology to realize the reliable digital TV anti-noise digital wireless broadcasting.

Using the digital TV wireless multimedia broadcasting transmission system to provide controllable multi-services such as free TV broadcasting, paid TV broadcasting, confidential information transmission, and multimedia value-added services is a manifestation of the new generation of digital TV anti-noise digital wireless broadcasting transmission system meeting social needs.

Based on the above background, the present invention proposes an anti-noise digital wireless broadcast signal transmission method for the actual communication environment, which can meet the needs of high data rate controllable multi-service digital TV anti-noise digital wireless broadcast transmission.

For a more in-depth understanding of the patent background, please refer to the following literature:

R.V.Nee, R.Prasad. "OFDM for wireless multimedia communications". Boston: Artech House, 2000.

Y. Wu, S. Hirakawa, U.H. Reimers, and J. Whitaker. "Overview of digital television development," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.8-21, Jan.2006.

U.Ladebusch and C.A.Liss. "Terrestrial DVB(DVB-T): A broadcasttechnology for stationary portable and mobileuse," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emergingan Services, pp.183-194, J 2006.

M. Takada and M. Saito. "Transmission systems for ISDB-T," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.251-256, Jan.2006.

G.Caire, G.Taricco, E.Biglieri, "Bit-interleaved coded modulation," IEEE Trans.Information Theory, vol.44, no.3, pp.927-946, May 1998.

Contents of the invention

Aiming at the problem of high data rate controllable multi-service digital TV anti-noise digital wireless broadcasting, the invention proposes an anti-noise digital wireless broadcasting signal transmission method.

A kind of anti-noise digital wireless broadcasting signal transmission method that the present invention proposes is characterized in that it comprises the following steps:

1) The anti-noise digital wireless broadcast signal transmitter converts the multimedia data stream into a bit stream through the media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form the input data bit stream;

2) The anti-noise digital wireless broadcasting signal transmitter passes its input data bit stream through LDPC encoding, bit interleaving, and symbol modulation to form an FFT bit interleaving encoding modulation data block in the frequency domain. LDPC means low-density parity check, and FFT Represents fast discrete Fourier transform, and the length of the FFT bit-interleaved coded modulation data block is K;

3) The anti-noise digital wireless broadcasting signal transmitter uses IFFT to transform the FFT bit interleaved coded modulation data block into a time-domain discrete bit interleaved coded modulated data sample block D _total , and IFFT stands for Inverse Fast Discrete Fourier Transform;

4) The anti-noise digital wireless broadcast signal transmitter divides the time-domain discrete bit interleaving coded modulation data sample block into two equally in order, the time domain discrete bit interleaved coded modulation data sample sub-block D ₁ and the time domain discrete bit interleaved coded Modulated data sample sub-block D ₂ , D _total = [D ₁ , D ₂ ];

并将降峰均功率比时域离散比特交织编码调制数据样值块

所对应采用的生成模式信息发送给业务指标序列设置单元，其中，D^* ₁表示对时域离散比特交织编码调制数据样值子块D₁的各时域离散比特交织编码调制数据样值进行共轭运算处理而得到的时域离散比特交织编码调制数据样值子块；5) The anti-noise digital wireless broadcasting signal transmitter performs signal addition to the time domain discrete bit interleaved coded modulation data sample sub-block D ₁ and the time domain discrete bit interleaved coded modulated data sample sub block D ₂ through the peak-to-average power ratio adjustment unit , subtraction, and conjugate operations to process and re-synthesize a new time-domain discrete bit interleaving coded modulation data sample block _Dnew , the new time domain discrete bit interleaved coded modulation data sample block _Dnew is obtained by the following generation mode, generation mode l For D _new = [D ₁ , D ₂ ], the generation mode 2 is ${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2)],$ Generate schema 3 as ${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generate schema 4 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 5 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 6 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generation mode 7 is D _new = [D ^* ₁ , D ₂ ], generation mode 8 is ${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2)],$ Generate schema 9 as ${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Generate schema 10 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 11 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 12 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Compare the time-domain discrete bit interleaving coded modulation data sample block D _new synthesized by 12 generation modes, and select the time domain discrete bit interleaved coded modulated data sample block with the lowest peak-to-average power ratio among them

And reduce the peak-to-average power ratio time-domain discrete bit interleaving code modulation data sample block

The corresponding generation mode information adopted is sent to the service index sequence setting unit, wherein, D ^* ₁ means that each time-domain discrete-bit-interleaved-coded-modulated data sample value of the time-domain discrete-bit-interleaved coded modulated data sample sub-block D ₁ is shared Time-domain discrete bit interleaved coded modulation data sample sub-blocks obtained by yoke operation processing;

6) The anti-noise digital wireless broadcast signal transmitter uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence set by the service index sequence setting unit as the imaginary part sequence of the complex training sequence to form a complex training sequence in the time domain The discrete sample value blocks of the sequence, the length of the discrete sample value blocks of the training sequence, the service index sequence, and the complex training sequence are all X, and the service index sequence contains and uniquely expresses the system parameters and parameters of the anti-noise digital wireless broadcast signal transmitter business model information;

7) The anti-noise digital wireless broadcasting signal transmitter repeats the discrete sample value blocks of the complex training sequence formed in the time domain continuously 4 times in the time domain to form a time domain embedded training sequence discrete sample value block, and the time domain embedded training sequence is discrete The length of the sample value block is equal to the length of the sample value block of the time-domain discrete bit interleaving coded modulation data with reduced peak-to-average power ratio, that is, K=4×X;

8) The anti-noise digital wireless broadcast signal transmitter directly superimposes the peak-to-average power ratio reduction time-domain discrete bit interleaving coded modulation data sample block and the time-domain embedded training sequence discrete sample block to form a time-domain embedded training sequence to reduce the peak-to-average power ratio Time-domain discrete bit interleaving coded modulation data sample block, as a frame body;

9) The anti-noise digital wireless broadcast signal transmitter uses the cyclic prefix as a guard interval, that is, inserts the frame header into the time domain embedding training sequence, reduces the peak-to-average power ratio, and time domain discrete bit interleaving codes the modulated data sample block, that is, the frame body, to form a signal frame, The length of the cyclic prefix is C;

10) The anti-noise digital wireless broadcast signal transmitter uses a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

11) The anti-noise digital wireless broadcast signal transmitter up-converts the baseband signal to the carrier to form a radio frequency signal and transmit it to the wireless channel in the air;

12) The anti-noise digital wireless broadcast signal receiver detects and receives the radio frequency signal sent by the anti-noise digital wireless broadcast signal transmitter and down-converts it to form a baseband signal, and uses the cyclic prefix characteristics of the signal frame and the structural characteristics of the signal frame to perform baseband signal Receive processing.

According to the above-mentioned anti-noise digital wireless broadcast signal transmission method, it is characterized in that: the peak-to-average power ratio of the anti-noise digital wireless broadcast signal transmitter is reduced by the time-domain discrete bit interleaved coded modulation data sample block by the time domain discrete bit interleaved coded modulated data The sample value sub-blocks are re-synthesized through signal addition, subtraction, and conjugate operation processing for 12 specific generation modes; the signal frame of the anti-noise digital wireless broadcast signal transmitter has periodic time-domain embedded training sequence discrete samples block; the length X of the training sequence of the anti-noise digital wireless broadcasting signal transmitter is one of 512, 1024, 2048, and the length K of the corresponding FFT bit interleaved coding modulation data block is respectively 2048, 4096, 8192, and the corresponding The frequency intervals of the subcarriers are 4KHz, 2KHz, and 1KHz, and the corresponding cyclic prefix lengths C are 1/4, 1/8, and 1/16 of the length K of the FFT bit-interleaving coded modulation data block; anti-noise digital wireless broadcasting The training sequence and service index sequence of the signal transmitter are composed of a series of 1 or -1, which have pseudo-random characteristics; the training sequence and service index sequence of the anti-noise digital wireless broadcast signal transmitter are orthogonal to each other; the anti-noise The various service index sequences of the digital wireless broadcast signal transmitter contain and uniquely express the system parameters and business mode information of the anti-noise digital wireless broadcast signal transmitter; the encoding rate of LDPC encoding for input data is 1/4, One of 1/2, 5/8, 3/4, and 7/8; random interleaving is used for bit interleaving; one of QPSK, 16QAM, 32QAM, and 64QAM is used for symbol modulation, and Gray is used for symbol constellation mapping code mapping. The anti-noise digital wireless broadcast signal receiver can make full use of the cyclic prefix characteristics of the signal frame and the structural characteristics of the signal frame for baseband signal reception processing, including joint iterative separation processing of the time-frequency domain of the signal frame header and signal frame body.

Features of the present invention:

The present invention is a mixed transmission scheme of time domain and frequency domain. The generation mode of the peak-to-average power ratio time-domain discrete bit interleaving coded modulation data sample block and the method for selecting the peak-to-average power ratio time-domain discrete bit interleaved coded modulation data sample block with the lowest peak-to-average power ratio of the present invention not only The maximum peak power of the OFDM signal can be fully utilized, but the probability of the high peak power signal is very low. When the number of subcarriers is large, the real part (or imaginary part) of the OFDM signal is a complex Gaussian random process and the amplitude obeys the characteristics of Rayleigh distribution. , the amount of additional information required for the adopted generation mode is small, and it is easy to process and recover the original signal of the OFDM signal at the receiver, and at the same time, it will not destroy the orthogonality characteristics of the subcarrier signal and will not generate additional nonlinear distortion. The signal frame of the anti-noise digital wireless broadcast signal transmitter has periodic time-domain embedded training sequence discrete sample blocks, the training sequence and service index sequence of the anti-noise digital wireless broadcast signal transmitter have pseudo-random characteristics, and the anti-noise digital wireless broadcast signal transmitter has pseudo-random characteristics. The training sequence and the service index sequence of the broadcast signal transmitter are orthogonal to each other, and the time-domain embedding training sequence of the anti-noise digital wireless broadcast signal transmitter reduces the peak-to-average power ratio to the time-domain discrete bit interleaving code modulation data sample block is It is formed by the direct superposition of the time-domain discrete bit-interleaved coded modulation data sample blocks and the time-domain embedded training sequence discrete sample blocks, which ensure that the anti-noise digital wireless broadcast signal receiver can achieve fast and accurate frame Synchronization, frequency synchronization, time synchronization, estimation of channel transmission characteristics, and reliable tracking of phase noise and channel transmission characteristics. Inserting the cyclic prefix as a guard interval into the time-domain embedding training sequence to reduce the peak-to-average power ratio time-domain discrete bit interleaving coded modulation data sample block to form a signal frame can reduce the interference between adjacent signal frames. Using BICM to perform bit-interleaved coding and modulation on the input data improves the diversity order and makes the communication system have good bit error characteristics in multi-path fading channels. Each different service index sequence of the anti-noise digital wireless broadcast signal transmitter contains and uniquely expresses each system parameter and business mode information of the anti-noise digital wireless broadcast signal transmitter, which can enable the digital TV anti-noise digital wireless broadcast transmission system to be able to Provide controllable multi-services such as free TV broadcasting, paid TV broadcasting, confidential information transmission, and multimedia value-added services to meet social needs. The transmission method of the present invention has low peak-to-average power ratio, short synchronization time, small clock jitter, anti-channel fading, anti-channel interference, can provide high-bit interleaved coding modulation data rate controllable multi-service digital TV anti-noise digital wireless broadcast transmission, etc. Many advantages.

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of signal transmission between a certain transmitter and a receiver according to the anti-noise digital wireless broadcasting signal transmission method of the present invention.

Fig. 2 is a schematic diagram of an embodiment of signal frame formation during signal transmission between a transmitter and a receiver according to the anti-noise digital wireless broadcasting signal transmission method of the present invention.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

According to the schematic diagram of an embodiment of signal transmission between a transmitter and a receiver of the anti-noise digital wireless broadcasting signal transmission method proposed by the present invention, as shown in Figure 1, the following steps are carried out:

1) The certain anti-noise digital wireless broadcast signal transmitter converts the multimedia data stream into a bit stream through a media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form an input data bit stream;

2) The certain anti-noise digital wireless broadcasting signal transmitter forms an FFT bit interleaved coded modulation data block in the frequency domain after its input data bit stream undergoes LDPC coding, bit interleaving, and symbol modulation, and FFT stands for Fast Discrete Fourier Transform , the length of the FFT bit-interleaved coding modulation data block is K; the coding rates of LDPC coding for input data are 1/4, 1/2, 5/8, 3/4 and LDPC coding, bit interleaving, and symbol modulation processing One of 7/8, the bit interleaving adopts random interleaving, the symbol modulation is one of QPSK, 16QAM, 32QAM and 64QAM, and the symbol constellation mapping method adopts Gray code mapping.

3) The certain anti-noise digital wireless broadcast signal transmitter uses IFFT to transform the FFT bit-interleaved coded modulation data block into a time-domain discrete bit-interleaved coded modulated data sample block D _total , and IFFT stands for Inverse Fast Discrete Fourier Transform;

4) The certain anti-noise digital wireless broadcasting signal transmitter divides the time-domain discrete bit interleaved coded modulation data sample block into two in order, the time domain discrete bit interleaved coded modulated data sample sub-block _D1 and the time domain discrete Bit interleaved coded modulation data sample sub-block D ₂ , D _total = [D ₁ , D ₂ ];

并将降峰均功率比时域离散比特交织编码调制数据样值块

所对应采用的生成模式信息发送给业务指标序列设置单元，其中，D^* ₁表示对时域离散比特交织编码调制数据样值子块D₁的各时域离散比特交织编码调制数据样值进行共轭运算处理而得到的时域离散比特交织编码调制数据样值子块；5) The certain anti-noise digital wireless broadcasting signal transmitter uses the peak-to-average power ratio adjustment unit to adjust the time domain discrete bit interleaved coded modulation data sample sub-block D ₁ , the time domain discrete bit interleaved coded modulated data sample sub block D ₂ Perform signal addition, subtraction, and conjugate operation processing and re-synthesize a new time-domain discrete bit interleaving coded modulation data sample block _Dnew , and the new time domain discrete bit interleaved coded modulation data sample block _Dnew is obtained using the following generation mode, Generation mode 1 is D _new = [D ₁ , D ₂ ], generation mode 2 is ${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2)],$ Generate schema 3 as ${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generate schema 4 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 5 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 6 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generation mode 7 is D _new = [D ^* ₁ , D ₂ ], generation mode 8 is ${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2)],$ Generate schema 9 as ${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Generate schema 10 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 11 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 12 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Compare the time-domain discrete bit interleaving coded modulation data sample block D _new synthesized by 12 generation modes, and select the time domain discrete bit interleaved coded modulated data sample block with the lowest peak-to-average power ratio among them

And reduce the peak-to-average power ratio time-domain discrete bit interleaving code modulation data sample block

The corresponding generation mode information adopted is sent to the service index sequence setting unit, wherein, D ^* ₁ means that each time-domain discrete-bit-interleaved-coded-modulated data sample value of the time-domain discrete-bit-interleaved coded modulated data sample sub-block D ₁ is shared Time-domain discrete bit interleaved coded modulation data sample sub-blocks obtained by yoke operation processing;

6) The certain anti-noise digital wireless broadcast signal transmitter uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence set by the service index sequence setting unit as the imaginary part sequence of the complex training sequence, in the time domain The discrete sample value blocks that constitute the complex training sequence, the length of the discrete sample value blocks of the training sequence, the service index sequence, and the complex training sequence are all X, and the service index sequence contains and uniquely expresses each of the anti-noise digital wireless broadcast signal transmitters. System parameters and business mode information, X takes one of 512, 1024, and 2048;

7) The certain anti-noise digital wireless broadcast signal transmitter repeats the discrete sample value block of the complex training sequence formed on the time domain continuously for 4 times in the time domain to form a time domain embedded training sequence discrete sample value block, and the time domain embedding The length of the training sequence discrete sample block is equal to the length of the peak-to-average power ratio time-domain discrete bit interleaving coded modulation data sample block, that is, K=4×X; when X is 512, K is 2048, corresponding to The frequency interval of the corresponding subcarrier is 4KHz; when X is 1024, K is 4096, and the frequency interval of the corresponding subcarrier is 2KHz; when X is 2048, K is 8192, and the frequency interval of the corresponding subcarrier is 1KHz;

8) The certain anti-noise digital wireless broadcasting signal transmitter directly superposes the peak-to-average power ratio time-domain discrete bit interleaving coded modulation data sample block and the time-domain embedded training sequence discrete sample block to form a time-domain embedded training sequence peak reduction Average power ratio time-domain discrete bit interleaving coded modulation data sample block, as a frame body;

9) The anti-noise digital wireless broadcast signal transmitter uses the cyclic prefix as a guard interval, that is, inserts the frame header into the time domain embedding training sequence, reduces the peak-to-average power ratio, and time domain discrete bit interleaving codes the modulated data sample block, that is, the frame body, to form Signal frame, the length of the cyclic prefix is C; when X is 512, C is 1/4 of the size of K; when X is 1024, C is 1/8 of the size of K; when X is 2048, C is of the size of K 1/16 of;

10) The certain anti-noise digital wireless broadcast signal transmitter adopts a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

11) The certain anti-noise digital wireless broadcast signal transmitter up-converts the baseband signal to the carrier to form a radio frequency signal and transmits it to the wireless channel in the air;

12) The certain anti-noise digital wireless broadcast signal receiver detects and receives the radio frequency signal sent by the anti-noise digital wireless broadcast signal transmitter and down-converts it to form a baseband signal, using the cyclic prefix characteristics of the signal frame and the structural characteristics of the signal frame Perform baseband signal reception processing, including joint iterative separation processing of the time-frequency domain of the signal frame header and signal frame body.

According to the schematic diagram of an embodiment of signal frame formation in the signal transmission process between a transmitter and a receiver of the anti-noise digital wireless broadcasting signal transmission method of the present invention, as shown in Figure 2, the specific implementation is as follows:

The certain anti-noise digital wireless broadcast signal transmitter converts the multimedia data stream into a bit stream through a media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form an input data bit stream.

The certain anti-noise digital wireless broadcasting signal transmitter forms FFT bit interleaving coded modulation data block in the frequency domain after its input data bit stream undergoes LDPC encoding, bit interleaving, and symbol modulation, and then transforms it into a time frame by IFFT The discrete bit-interleaved coded modulation data sample block in the domain is generated by the peak-to-average power ratio adjustment unit to select the time-domain discrete bit-interleaved coded modulated data sample block with the lowest peak-to-average power ratio. The generation mode information of is sent to the business indicator sequence setting unit. The coding rate of LDPC coding for input data is 1/4, 1/2, 5/8, 3/4 and 7/8, bit interleaving adopts random interleaving method , the symbol modulation is one of QPSK, 16QAM, 32QAM and 64QAM, and the symbol constellation mapping method adopts Gray code mapping.

The FFT bit-interleaved coded modulation data block consists of subcarriers. The length of the FFT bit-interleaving coded modulation data block is K; when X is 512, the corresponding K is 2048, and the frequency interval of the corresponding subcarrier is 4KHz; when X is 1024, the corresponding K is 4096, corresponding The frequency interval of the corresponding subcarriers is 2KHz; when X is 2048, the corresponding K is 8192, and the frequency interval of the corresponding subcarriers is 1KHz.

The certain anti-noise digital wireless broadcast signal transmitter uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence as the imaginary part sequence of the complex training sequence to form discrete sample value blocks of the complex training sequence in the time domain, Repeat it four times continuously in the time domain to form discrete sample blocks of time domain embedding training sequence. The length of the discrete sample block of the training sequence, the service index sequence, and the complex training sequence is X, where X is one of 512, 1024, and 2048, and the length of the discrete sample block of the time domain embedded training sequence is K, K=4× X.

As the anti-noise digital wireless broadcast signal transmitter, the training sequence and service index sequence are composed of a series of 1 or -1, which have pseudo-random characteristics, and the training sequence and service index sequence are orthogonal to each other. The training sequence satisfying the above characteristics can be realized by a special type of shifted m-sequence as a pseudo-random number sequence and Walsh sequence, Hadamard sequence or orthogonal sequence generated by other methods as an orthogonal sequence. Each different service index sequence contains and uniquely expresses various system parameters and service mode information of the anti-noise digital radio broadcast signal transmitter.

This certain anti-noise digital wireless broadcasting signal transmitter directly superimposes the peak-to-average power ratio of the time-domain discrete bit interleaved coded modulation data sample block and the time-domain embedded training sequence discrete sample block to form a time-domain embedded training sequence with peak-to-average power reduction The time-domain discrete bit interleaving coded modulation data sample block is used as a frame body; the peak-to-average power ratio time domain embedded training sequence is reduced by inserting a cyclic prefix into the time domain discrete bit interleaved coded modulated data sample block as a guard interval to form a signal frame . The length of the cyclic prefix used as the guard interval is C; when X takes 512, the corresponding C takes 1/4 of the size of K; when X takes 1024, the corresponding C takes 1/8 of the size of K; when X takes At 2048, the corresponding C takes 1/16 of the size of K.

The certain noise-resistant digital radio broadcast signal transmitter employs a square root raised cosine roll-off filter to pulse-shape the signal of the signal frame. When X is 512, the roll-off coefficient of the square root raised cosine roll-off filter corresponding to the pulse shaping of the signal frame is 0.1; when X is 1024, the corresponding pulse shaping of the signal frame is The roll-off coefficient of the square root raised cosine roll-off filter is 0.05; when X is 2048, the corresponding roll-off coefficient of the square root raised cosine roll-off filter for pulse shaping the signal frame is 0.025.

The certain anti-noise digital wireless broadcast signal transmitter converts the baseband signal up to the carrier to form a radio frequency signal and transmits it to the wireless channel in the air.

The anti-noise digital wireless broadcast signal receiver detects and receives the radio frequency signal sent by the wireless digital broadcast signal transmitter and converts it down to form a baseband signal, and uses the cyclic prefix characteristics of the signal frame and the structural characteristics of the signal frame to receive the baseband signal The processing includes joint iterative separation processing of the time-frequency domain of the signal frame header and the signal frame body.

The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and those skilled in the art can make various modifications without departing from the spirit and scope of the claims of the application modify or remodel.

Claims (8)

1. An anti-noise digital radio broadcasting signal transmission method is characterized in that it comprises the following steps: 1) The anti-noise digital wireless broadcast signal transmitter converts the multimedia data stream into a bit stream through the media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form the input data bit stream; 2) The anti-noise digital wireless broadcasting signal transmitter passes its input data bit stream through LDPC encoding, bit interleaving, and symbol modulation to form an FFT bit interleaving encoding modulation data block in the frequency domain. LDPC means low-density parity check, and FFT The length of the bit-interleaved coding modulation data block is K; 3) The anti-noise digital wireless broadcasting signal transmitter adopts IFFT to transform the FFT bit interleaved coded modulation data block into a time domain discrete bit interleaved coded modulated data sample block D _total ; 4) The anti-noise digital wireless broadcast signal transmitter divides the time-domain discrete bit interleaving coded modulation data sample block into two equally in order, the time domain discrete bit interleaved coded modulation data sample sub-block D ₁ and the time domain discrete bit interleaved coded Modulated data sample sub-block D ₂ , D _total = [D ₁ , D ₂ ]; 5) The anti-noise digital wireless broadcasting signal transmitter performs signal addition to the time domain discrete bit interleaved coded modulation data sample sub-block D ₁ and the time domain discrete bit interleaved coded modulated data sample sub block D ₂ through the peak-to-average power ratio adjustment unit , subtraction, and conjugate independent operation processing or combined operation processing and resynthesis of a new time domain discrete bit interleaving coded modulation data sample block D _new , the new time domain discrete bit interleaved coded modulation data sample block D _new is generated as follows The mode is obtained, the generation mode 1 is D _new = [D ₁ , D ₂ ], and the generation mode 2 is ${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2)],$ Generate schema 3 as ${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generate schema 4 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 5 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 6 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generation mode 7 is D _new = [D ^* ₁ , D ₂ ], generation mode 8 is

Generate schema 9 as ${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Generate schema 10 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 11 as

Generate schema 12 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Compare the time-domain discrete bit interleaving coded modulation data sample block D _new synthesized by 12 generation modes, and select the time domain discrete bit interleaved coded modulated data sample block with the lowest peak-to-average power ratio among them

And reduce the peak-to-average power ratio time-domain discrete bit interleaving code modulation data sample block

The corresponding generation mode information adopted is sent to the service index sequence setting unit, wherein, D ^* ₁ means that each time-domain discrete-bit-interleaved-coded-modulated data sample value of the time-domain discrete-bit-interleaved coded modulated data sample sub-block D ₁ is shared Time-domain discrete bit interleaved coded modulation data sample sub-blocks obtained by yoke operation processing; 6) The anti-noise digital wireless broadcast signal transmitter uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence set by the service index sequence setting unit as the imaginary part sequence of the complex training sequence to form a complex training sequence in the time domain The discrete sample value blocks of the sequence, the length of the discrete sample value blocks of the training sequence, the service index sequence, and the complex training sequence are all X, and the service index sequence contains and uniquely expresses the system parameters and parameters of the anti-noise digital wireless broadcast signal transmitter business model information; 7) The anti-noise digital wireless broadcasting signal transmitter repeats the discrete sample value blocks of the complex training sequence formed in the time domain continuously 4 times in the time domain to form a time domain embedded training sequence discrete sample value block, and the time domain embedded training sequence is discrete The length of the sample value block is equal to the length of the sample value block of the time-domain discrete bit interleaving coded modulation data with reduced peak-to-average power ratio, that is, K=4×X; 8) The anti-noise digital wireless broadcast signal transmitter directly superimposes the peak-to-average power ratio reduction time-domain discrete bit interleaving coded modulation data sample block and the time-domain embedded training sequence discrete sample block to form a time-domain embedded training sequence to reduce the peak-to-average power ratio Time-domain discrete bit interleaving coded modulation data sample block, as a frame body; 9) The anti-noise digital wireless broadcast signal transmitter uses the cyclic prefix as a guard interval, that is, inserts the frame header into the time domain embedding training sequence, reduces the peak-to-average power ratio, and time domain discrete bit interleaving codes the modulated data sample block, that is, the frame body, to form a signal frame, The length of the cyclic prefix is C; 10) The anti-noise digital wireless broadcast signal transmitter uses a square root raised cosine roll-off filter to shape the signal pulse of the signal frame; 11) The anti-noise digital wireless broadcast signal transmitter up-converts the baseband signal to the carrier to form a radio frequency signal and transmit it to the wireless channel in the air; 12) The anti-noise digital wireless broadcast signal receiver detects and receives the radio frequency signal sent by the anti-noise digital wireless broadcast signal transmitter and down-converts it to form a baseband signal, and uses the cyclic prefix characteristics of the signal frame and the structural characteristics of the signal frame to perform baseband signal Receive processing. 2. by the anti-noise digital wireless broadcasting signal transmission method of claim 1, it is characterized in that: the length X of the discrete sample value block of the training sequence of described anti-noise digital wireless broadcasting signal transmitter, service index sequence, complex number training sequence is taken One of 512, 1024, 2048. 3. The anti-noise digital wireless broadcast signal transmission method according to claim 2, characterized in that: said training sequence and service index sequence are composed of a series of 1 or -1, and have pseudo-random characteristics. 4. The anti-noise digital wireless broadcasting signal transmission method according to claim 2, characterized in that: said training sequence and service index sequence are orthogonal to each other. 5. by the anti-noise digital wireless broadcasting signal transmission method of claim 1, it is characterized in that: said FFT bit interleaving coding modulation data block is made up of subcarrier; When X gets 512, subcarrier number gets 2048, and the frequency interval of subcarrier Take 4KHz; when X is 1024, the number of subcarriers is 4096, and the frequency interval of subcarriers is 2KHz; when X is 2048, the number of subcarriers is 8192, and the frequency interval of subcarriers is 1KHz. 6. by the anti-noise digital wireless broadcasting signal transmission method of claim 1, it is characterized in that: the length C value of described cyclic prefix is relevant with X value; When X gets 512, C gets 1/4 of K size; When X takes 1024, C takes 1/8 of the size of K; when X takes 2048, C takes 1/16 of the size of K. 7. by the anti-noise digital wireless broadcasting signal transmission method of claim 1, it is characterized in that: described input data is carried out LDPC coding, bit interleaving, the coding rate of the LDPC coding of symbol modulation process 1/4, 1/2 , 5/8, 3/4 and 7/8, the bit interleaving adopts random interleaving, the symbol modulation is one of QPSK, 16QAM, 32QAM and 64QAM, and the symbol constellation mapping method adopts Gray code mapping. 8. by the anti-noise digital radio broadcast signal transmission method of claim 1, it is characterized in that: the baseband signal receiving process that described anti-noise digital radio broadcast signal receiver carries out, one of the steps is signal frame head and signal frame body The time-frequency domain joint iterative separation process.

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